pH值对Reppe法生产1，4-丁二醇加氢工艺的影响

河南开祥精细化工有限公司4．5万t／a1，4-丁二醇装置采用Reppe法工艺技术。简述了该装置的加氢工艺流程和催化剂特性；建立了低压加氢反应器内物料的pH值与主产物BDO浓度以及产物中乙缩醛含量、羰基数、丁醇含量之间的关联曲线；确立了混合槽物料pH值（pH1）与低压加氢进料槽物料pH值（pH2）以及低压加氢反应器内物料pH值（pH3）三者之间的递减关系。研究结果表明：①将低压加氢反应器内物料pH值控制在7．0-7．5时，催化剂使用条件最佳，主产物BD0的含量最高，且各副产物浓度较低；②通过调整进料槽物料的pH值，可控制加氢反应器内物料的pH值。

Influence of pH Value on Hydrogenation Process for Producing 1, 4 - Butanediol with Reppe Method

The process technology with Reppe method has been adopted in the 1,4–Butanediol plant with a capacity of 45,000 t/a in Kaixiang Fine Chemistry Engineering Company Ltd.Author has briefly described the hydrogenation process flow and the characteristic of catalyst in this plant;has established the relation curves among the medium pH value in low pressure hydrogenation reactor,BOD concentration of product,content of by-product acetal,carbonyl number and butanol content;has determined the progressively decreasing relation among the three parts of medium pH value(pH1) in mixing tank,medium pH value(pH2) in low pressure hydrogenation feed tank and medium value(pH3) in low pressure hydrogenation reactor.Researching result indicates: (1)The operating condition is optimum,with a maximum content of the main products,and a lower concentration of every by-product,in case of taking the medium pH value in low pressure hydrogenation reactor being controlled in 7.0 ~ 7.5.(2)The pH value of medium in Hydrogenation reactor can be controlled by means of controlling the pH value of medium in the feed tank.